Pipe-threading mechanism



May 12, 1925. 1,537,493

H. D. PENNINGTON PIPE THREADING MECHANISM Filed May 18, 1923 2 Sheets-Sheet 1 Patented May 12, 1925.

UNITED STATES PATENT OFFICE.

HARLEY D. PENNINGTON, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR '10 UNITED ENGINEERING AND FOUNDRY COMPANY ,OF PIT'ESIBURGH, PENNSYLVANIA, A (JOB- IPORATION OF PENNSYLVANIA.

. PIPE-THBEADING MECHANISM. a

Application filed Kay 18, 1928. a Serial Nat 39,1786.

Toall whom it may concern:

Be it known that I, Harmer D. Pnm mo- TON, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Penns lvania, have invented a new and useful limprovement in Pipe- Threading Mechanism, of which the following is a full, clear, and exact description.-

The presentinvention relates to threading mechanism, and more particularly to plpethreading mechanism; t

In my copending application, Serial No. 624,759, filed March 13, 1923, there is shown and described a construction in which the threading die is automatically opened upon engagement of the end of the pipe being threaded with a reamer, the reamer actuating to released position a latch for holding the automatic die-opening means inoperative. Such construction is particularly adapted for threading pipe which comes to the threading machinein varying lengths and unreamed, since it embodies means for reaming and rounding the pipe, and cutting the same to length and trimming the ends thereof. However, it sometimes is desirable to use the cutting-off tool to cut off the ends of the pipe and face and ream the same; and furthermore, the pipe to be threaded often comes to the machinealready cut to length and reamed so that the only operation to be performed thereon by the threading machine is the threading operation. The present invention provides gravity operated latch means for controlling the opening of the threading die and adapted to be directly engaged and actuated to released position by the pipe being threaded.

In the accompanying drawings, there is shown for purposes of illustration only, one embodiment of the present invention, it being understood that the drawings do not define the limits of the invention, as changes may be made in the construction and opera tion therein disclosed without departing from the spirit of the invention or scope of my broader claim.

In the drawings:

Figure; 1 is a plan view of the reciprocat-- ing carriage of a pipe threading mechanism embodyin my invention and the parts carried therei a Figure 2 is a view, partly in longitudinal swing inwardly about said pivot bolt to section and partly I in elevation, of the parts lllustrated .in F1 Figure 3 is a ront view of the threadingdie and the means constituting the embodipartly in section, of a portion of said means The threading die is made in two parts 14 and 15 mounted upon a die-head 16, each part being pivoted at its lower end upon a bolt 17 carried by said head. Each of the parts 14 and 15 is provided at its upper end with a pin 18 engaging in a cam slot 19 in a cam disc 20. It will be apparent that iotation of the cam disc 20 in one direction will cause the parts 14 and 15 to swing outwardly about the pivot bolt 17 to open the die,'and that movement of said disc in the opposite direction Will cause said parts to close the die.

A connecting rod 21 is pivotally mounted at one end upon a pin 22 projecting upwardly from the camdisc 20, and at. its opposite end is pivotally connectedto one end of a lever 23; The lever 23, at its opposite end, is fixed to the upper end of. a vertical shaft 24 journaled in the carriage C. A spring 25 is connected at one end to the lever 23, and

at itsoppositeend to the-carriage C, this spring tending to move the lever 23 in a direction to open the threading die. The

cam disc 20 is provided with a handle 26,

whereby said cam disc may be manually moved in.a direction to close the threading die. V

Fastened to the front ofthe die-head '16 is a bracket 32 provided with integral spaced latter and engage the endportion 39 of arm 40 to thereby maintain said arm in any desired adjusted position. In Figure 4 I have illustrated the arm 40 in one adjusted positionvin full lines and in another adjusted position in dotted lines.

The operation of the construction described is substantially as follows: The spring 25, through the lever 23 and link 21, normally maintains the cam disc in such polslition as to hold the threading die open. p p

en the cam disc 20, is rotated into the position in which it is shown in Figure 1,

the shoulder 37 is engaged by the end of the detent arm 36 to maintain the cam disc in such position. In this position of the cam disc the threading die is. held closed. It will be apparent that the trip-arm 40' constitutes gravity-actuated means tendin to rotate the etent arm 36 in a clockwise direction. (Fig- .ure 4) whereby the end of said detent arm is maintained always in engagement with the peripheral edge of the cani disc, so that 'said detent arm automatically engages the shoulder 37 as soon as the cam disc is ro tated into the osition in which it is shown in Figure 1. he operative may cause the rotation of the cam disc intothis osition either by means of the hand1e26 or y moving the carriage C on the bed of the machine to engage the arm 31 of shaft 24, with a stationary abutment, whereu' on continued movement of the carriage in t e same direction causes the arm 31 to be swung from the dotted line position to the full line position thereof shown in Figure 1, thereby effecting the desired movement of the cam disc 20 to close the threading die. The pipe to be threaded is held in pipe-rotating means which holds the pipe against axial movement,'so' that the threading operation causes the carriage C to move towards the pipe-' rotating means until the endkof' the pipe 9 engages the trip-arm 40, whereupon continued movement of the carriage C towards the pipe rotating means causes said trip arm to be raised, thereby rocking the detent arm 36 out of engagement with the shoulder 37 of the cam disc 20; Immediately that this occurs, the spring 25, throughthelever 23 and link 21, effects rotation of the cam disc of any operation except in the direction of the arrow (Figure 1), thereby opening the threading die. The edge portion 20 of the cam disc 20 adjacent the shoulder 37 is eccentric with-respect to theaxis of rotation of said disc, so that the rotation of the disc in the die-opening direction insures the raising of the tri -arm 40 to a suflicient height to clearthe incoming It will be apparent that the length of-the thread out upon the end of the pipe may be predetermined in. accordance with the adjlustment ofth e trip-arm 40 in the boss 35. t will also be apparent that the provision of the latch means described for controlling the operation of the automatic die-opening means renders the 0 ration of fiflld dieopfining means entire independent of'any ot er reaming operation.

The advantages of thexipres 'enti invention arise from the provisidnof latchmeans of operation on t e pipfe'g'such asvthe :from said a trip arm slidably mounted in said detent arm and held in adjusted position by said journal members, said. trip. arm being arranged to be engaged by the end of the pipe being threaded whereby to move said detent arm to released position.

In testimony whereof I have hereunto set my hand.

HARLEY D. PENNINGTON. 

